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1、橋梁建設(shè)2017年第47卷第4期(總第245期)30BridgeConstruction,Vol.47,No.4,2017(TotallyNo.245)文章編號(hào):1003-4722(2017)04-0030-06高速列車作用下大跨鋼桁拱橋應(yīng)變響應(yīng)分析11,23趙瀚瑋,丁幼亮,李愛群(1.東南大學(xué)混凝土及預(yù)應(yīng)力混凝土結(jié)構(gòu)教育部重點(diǎn)實(shí)驗(yàn)室,江蘇南京210096;2.河北省大型結(jié)構(gòu)健康診斷與控制實(shí)驗(yàn)室,河北石家莊050043;3.北京建筑大學(xué)北京未來城市設(shè)計(jì)高精尖創(chuàng)新中心,北京100044)摘要:為了解大跨鋼桁拱橋在高速列車和環(huán)境溫度作用下
2、的動(dòng)力響應(yīng)特征,基于南京大勝關(guān)長江大橋健康監(jiān)測(cè)系統(tǒng)2015年采集的動(dòng)應(yīng)變、溫度、車速的長期監(jiān)測(cè)數(shù)據(jù),分析大跨鋼桁拱橋在高速列車作用下的動(dòng)應(yīng)變響應(yīng),研究關(guān)鍵構(gòu)件的應(yīng)變影響線與溫度的相關(guān)性特征和應(yīng)變動(dòng)力系數(shù)與車速的相關(guān)性特征。結(jié)果表明:高速列車作用下,拱腳桁架處的應(yīng)變影響線最大值最大,其次為主拱桁架和邊跨桁架,拱橋吊桿的最小;吊桿的應(yīng)變動(dòng)力系數(shù)值偏大;各構(gòu)件的應(yīng)變影響線與溫度有明顯相關(guān)性,復(fù)雜受力區(qū)域呈高次相關(guān),單一受力區(qū)域呈線性相關(guān);各構(gòu)件的應(yīng)變動(dòng)力系數(shù)與車速線性相關(guān),邊跨桁架、吊桿和主拱桁架的應(yīng)變動(dòng)力系數(shù)隨車速增加而上升,拱腳桁架的應(yīng)
3、變動(dòng)力系數(shù)隨車速增加而下降。關(guān)鍵詞:鋼桁拱橋;高速列車;應(yīng)變響應(yīng);健康監(jiān)測(cè);溫度;車速;應(yīng)變影響線;應(yīng)變動(dòng)力系數(shù)中圖分類號(hào):U448.13;U448.224文獻(xiàn)標(biāo)志碼:AAnalysisofStrainResponsesofLongSpanSteelTrussArchBridgeUnderActionofHigh‐SpeedTrains11,23ZHAOHanwei,DINGYouliang,LIA‐iqun‐(1.KeyLaboratoryofConcreteandPrestressedConcreteStructuresofMin
4、istryofEducation,SoutheastUniversity,Nanjing210096,China;2.KeyLaboratoryofLargeStructureHealthDiagnosisandControlofHebeiProvince,Shijiazhuang050043,China;3.BeijingAdvancedInnovationCenterforFutureUrbanDesign,BeijingUniversityofCivilEngineeringandArchitecture,Beijing1000
5、44,China)Abstract:Tounderstandthedynamicresponsecharacteristicsofthelongspansteeltrussarchbridgeundertheactionofthehigh‐speedtrainsandambienttemperatures,thedynamicstrainre‐sponsesofthebridgeundertheactionofthehigh‐speedtrainswereanalyzedbasedonthelong‐termmonitoringdat
6、aofthedynamicstrain,temperaturesandtrainspeedsacquiredbythestruc‐turalhealthmonitoringsystemofNanjingDashengguanChangjiangRiverBridgeintheyearof2015andthecorrelativitycharacteristicsbetweenthestraininfluencelinesandtemperaturesandbetweenthestraindynamicfactorsandtrainsp
7、eedsofthecriticalcomponentsofthebridgewerestudied.Theresultsoftheanalysisandstudyrevealthatundertheactionofthehigh‐speedtrains,themaximumvalueofthestraininfluencelinesofthearchspringtrussesofthebridgeisthegrea‐test,ofthemainarchtrussesandsidespantrussesissecondaryandoft
8、hehangersistheleast.Thestraindynamicfactorvaluesofthehangersareabitgreat.Thestraininfluencelinesofthedifferent